Weak Pump Or Crazy Physics?

Not all pumps have the same output pressure. They may run as low as 1Lb psi or as high as 7 psi or higher. Yes it's physics. The more water the greater the downward pressure you are trying to overcome. Ever noticed the pressure on your ears when at the bottom of a swimming pool vs being out of the pool?

Here is a basic chart for aquarium application
 
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